Drill.



E. 0. LONG.

DRILL.

APPLICATION FILED AUG.20, 1912.

Patented Aug. 5, 1913.

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EDVJARD C. LONG, 01? DANTE, VIRGINIA, ASSIGNOR OF ONE-HALF TO W. L. COUNTS, F DANTE, VIRGINIA.

DRILL.

Application filed August 20, 1912.

To all to/w'm, it may concern Be it known that I, EDWARD C. LONG, a citizen of the United States, residing at Dante, in the county of Russell and State of Virginia, have invented certain new and useful Improvements in Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in breast drills and the prime object of the invention is to provide a breast drill frame of extremely simple construc- 'tion.

A further object of my invention is to provide a simple locking means for securely holding a drill bit in place.

Another object of the invention is to provide a breast drill of this character which is especially applicable as a coal-drill for mining hard coal.

Other objects and advantages of my invention will be hereinafter made clearly apparent in the specification and pointed out in the claims.

In the accompanying drawings I have shown the preferred form which my invention may take.

In said drawings, Figure 1 is an elevation showing the preferred construction of my invention, a portion thereof being shown in section, Fig. 2 is a side elevation of a breast drill, with portions thereof being shown in section, and,.Fig. 3 is a perspective detail view of the bracket 18 and its adjuncts in position to receive the boring tool or bit.

Referring to the drawings by numerals of reference, similar numerals designating corresponding parts throughout the several views, 3 is a shank, which is provided at one end with a breast plate d and at its other end with a pair of standards 5. The meeting point of the standards is curved, as indicated at 6, to form one half of a bearing for a double crank shaft 7. The standards 5 are connected intermediate their ends with a cross bar 8, which is provided with a bearing 9, for a purpose hereinafter made clearly apparent. The outer ends of the standards are bent away from one another and are adapted to be secured by means of bolts or in any other desired manner, to a plate 11. Said plate 11 is provided upon either Specification of Letters Patent.

Patented Au 5, 1913. Serial No. 716,073.

side with a standard 12, the upper end of which is bifurcated and arranged to form the other side of the bearing for the double crank shaft 7. The crank arms of the double crank shaft 7 are preferably extended in the same direction, for a purpose hereinafter more clearly set forth, and said crank shaft is provided with an enlarged gear 18, which is ordinarily attached thereto and is adapted to mesh with a smaller gear lt. The gear let is provided with a pointed bearing 15 adapted to take into the bearing 9 and at its opposite end with a circular head 16 adapted to take through the circular hearing opening 17 formed in the plate 11. Secured to one side of the plate 11 is a downwardly extending L-shaped bracket 18, the lower end of which is directed inwardly in the manner shown in the drawings. The upper end of the bracket is provided with an inwardly extending plate 19, through which one of the bolts 10 extends, and a flange 20 is also formed at the upper end of the bracket and extends along the side of the plate 11 so that the bracket, which is secured by means of a bolt, will be rigidly held in place. The lower end of the bracket 18 is extended laterally and comprises a bearing plate 18, provided with a notch 21 extending inwardly from one side thereof,

while the upper bearing-plate 22 is pivotlly secured to the upper surface of said lower bearing-plate in the manner indicated in the drawing. Said upper bearing plate is also provided with a similar notch 23 in its side opposite the notch 21, the inner ends of said notches being semi-cylindrical and arranged so that when said upper bearing plate and the lower bearing-plate are disposed in alinement, a circular bearing is formed, said bearing being arranged in axial alinement with the head 16. The upper bearing plate 22 is pivotally secured to the lower bearing by means of bolt 22 and is adapted to be swung horizontally in and out of alinement with the lower bearing-plate and adapted to be normally held in alinement with the lower bearing plate 18 by means of a spring-pressed pin 24, which is adapted to extend into a seat 25 formed in the lower bearing plate, as clearly shown in Fig. 2.

In using my improved breast-drill I employ bits 26, which are formed with angular A ends 27 adapted to extend into a similarly formed angular opening in the head 16, and the shank of said bit is provided with an integral collar 28, which, when the integral end of the bit is inserted into the head 16 and the bearing plate locked in position, will rest against the upper surface of said bearing block, as clearly shown in Fig. 1.

This-breast drill is especially adapted for use with drill-bits of the non-self-feeding type, which must be pressed inward with considerable force while in operation; and so, the two opposite cranks are extendedin the same direction, so that the operator may bear his entire weight on the two cranks, during a portion of their revolution, said operators hands supporting his weight while his breastis relieved of undue pres sure on the plate 4, and said plate now serves to steady the drill while the revolution of the cranks is being completed.

The angular end 27 is slightly less in length than the height of the bearing block, so that when it is desired to remove the bit, it is-only necessary to raise the pin 24 from its seat and swing the bearing plate upon its pivot and to pull the bit outwardly. When the bit has been pulled until the collar thereof engages the bracket 18, the angular end will have cleared the opening in the head 16 and the bit may then be moved sidewise out of the frame. By this construction it will be seen that I have provided a drilling device, which is of an extremely simple and cheap construction in which'the parts may be readily renewed, when broken or worn. It will further be seen that I have provided a very simple arrangement for fastening bits in operative position. Having thus carefully set forth my invention, further description is deemed unnecessary.

What I claim as new is:

1. A device of the class described comprising a shank, standards formed integrally with said shank, a plate secured to the ends of said standards, a pair of bearing standards extending upwardly from said plate and arranged at right angles to the standards on said shank, a crank shaft journaled in the ends of said bearing standards and meeting ends of said first mentioned standards, a drive gear upon said crank Copies of this patent may be obtained for shaft, a gear arranged in alinement with said shank and meshing with "said first mentioned gear, a bearing for said gear arranged in said plate, said gear having a bit engaging opening therein.

2. A device of the class described com prising a shank, a breast plate at one end of said shank, the other end of said shank being bifurcated, a plate secured to the bifurcated ends of said shank and at right angles to the axis thereof, standards on said plate 3. A device of the class described comprising a shank, a breast plate at one end of said shank, the other end of said shank be ing bifurcated, a plate secured to the bifurcated end of said shank and at right angles to the axis thereof, standards on said plate arranged at right angles to the bifurcated ends of said shank, said standards and the notch of said bifurcated ends forming a bearing, a double crank shaft arranged in said bearing, a drive gear secured to said crank shaft, a bit drive gear rotatably mounted in said plate in alinement with the axis of said shank and meshing with said drive gear, said drive gear having a bit engaging opening therein, a bracket secured to said plate and extending therebelow, a bearing plate pivotally secured to said bracket, said bracket and bearing plate having oppositely arranged notches, and a bit adapted to extend through said notches and into the opening in said bit driving gear.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses? EDvVARD C. LONG.

Witnesses:

R. L. Pownns, E. L. Jones.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

